The invention discloses a preparation method for an integrally-formed tungsten tube target material with a large length-to-diameter ratio, and the tungsten tube target material is used for magnetron sputtering coating. The preparation method comprises the following steps: taking tungsten powder with the purity being 99.9%-99.999% as a raw material, and filling the tungsten powder into a sheath; and then, carrying out hot vacuum outgassing, assembling the sheath subjected to the hot vacuum outgassing and a forming tool in a hot isostatic press to be pressed, thereby obtaining the tube target material with the large length-to-diameter ratio, which is integrally bound with a back tube, by mechanical processing. The integrally-formed tungsten tube target material with the large length-to-diameter ratio prepared by the preparation method has the following advantages: (1) the tungsten tube target material has high compactness, density of 19.1g/cm<3> or higher and relative density greater than 99%; (2) the oxygen content is controllable within a range of 10-1000 ppm; (3) crystalline grains are fine and uniform, and an average crystal grain dimension is lower than 100 [mu]m; (4) the length-to-diameter ratio of the tungsten tube target material is greater than 15:1, and straightness of the tungsten tube target material is smaller than 3 mm; and (5) a tungsten tube target material layer and the back tube are good in metallurgical bonding so that the needs of high-end sputter coating industry can be met.